He died during the 3:49 a.m. crash on I-78 East near mile marker 48.3, authorities report.

A tractor-trailer driven by James T. Sherry, 70, of Ebensburg, Pa., was entering the right line from the south shoulder and Cramer's truck was in the right lane, police report. A little less than a mile after Sherry's rig entered the highway, Cramer's truck slammed into the back of it, police said.

The trucks traveled more than 300 feet across the south shoulder and down an embankment, police said. Cramer's truck became engulfed in fire, police said.

An autopsy is scheduled Tuesday to determine Cramer's exact cause of death, the coroner's office reports.

The coroner's office and state police are investigating the crash. State police from Fogelsville and Hamburg, Pa., and the state police C.A.R.S unit assisted, along with the Fogelsville Fire Department, the Trexlertown Fire Department, the Upper Macungie Fire Department, the Lower Macungie Fire Department, the Tri-Clover Fire Department, the Weisenberg Fire Co. and the Cetronia Ambulance Corps, police said.

Police are asking anyone with information on the crash to call 610-395-1433 and ask for Trooper Stephen DeAngeles.